Thank you very much for explaining and your comprehensive help.
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user43816Jun 9 '12 at 11:13

There is a button having the tooltip: "Click to set this answer as your accepted answer. click again to toggle." There is no feedback when I click on it in the web service "Ask Ubuntu". It does not become green. Secondly, the tooltip has been appended this morning with the text "Accepted 6 mins ago." But I had not visited it 6 mins ago. acid3.acidtests.org shows that JavaScript is activated with me.
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user43816Jun 10 '12 at 6:50

@user43816 : it was accepted, I think you unaccepted it by mistake 6 minutes ago. Perhaps try logging out and logging in? Otherwise you can simply click the flag link below the answer and use the other option to inform a site moderator of this issue.
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izxJun 10 '12 at 6:56

izx: I logged out. I logged in. Now I was able to color the button green. -- Thank you again for your comprehensive help.
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user43816Jun 10 '12 at 16:45